RU2553616C2 - Bearing casing for roll bearing, and rolling line for continuous casting machine containing such roll bearing casing - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to the casing (1) of the roll bearing made with internal passage (7) with inlet hole (8) and outlet hole (10) for the cooling medium. The casing (1) is one-piece-cast element with passage (7) for the cooling medium, completely build in the product casing (1). Besides, rolling line for the continuous casting machine containing the said casing (1) is described.

EFFECT: increased service life of the bearing casing, and guarantee during manufacturing the absence of possible quality problems of the product, mainly cracks and corrosion due to welds.

14 cl, 4 dwg

Description

BACKGROUND

The present invention relates to a bearing housing for a rolling bearing and, in particular, to a rolling bearing housing having an internal passage for a cooling medium. The invention also relates to a rolling line for a continuous casting machine provided with such rolling bearing housings.

Such bearing housings typically operate at very high temperatures, for example, but not exclusively, in continuous casting machines, and therefore require cooling, which is usually done with a coolant.

In order to efficiently cool the bearing housing and the bearing housed therein, it is preferable to have a passage for a cooling medium located in the bearing housing product.

Such passages for cooling media to date have usually been carried out by means of channels drilled or made mechanically in different directions in two-piece bearing housings, where the channels communicate with a chamber located in the outer part of one of the bearing housing halves, while the chamber is closed by a lid welded to the body above the camera. Such bearing housings are described and illustrated, for example, in US Pat. No. 5,915,843.

An obvious drawback of such a bearing housing is that the manufacture of the bearing housing is quite expensive due to the steps of various machining and additional welding of the cap to the bearing housing in a fluid tight manner. It is also important that the welding operation is carried out properly, which is not easy, and the fact that defective welds can lead to cracks and leaks makes welding avoidance preferred.

OBJECT AND SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a bearing housing for a rolling bearing, made with an internal passage with an inlet and an outlet for a cooling medium, without the disadvantages of the prior art and less expensive to manufacture, which was achieved due to the fact that the bearing housing is made as solid element with a passage for the cooling medium, fully integrated into the product of the bearing housing.

Additional features of the invention are described in the dependent claims, which are part of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will now be further described with reference to an embodiment illustrated in the accompanying drawings.

FIG. 1 is a perspective view of a bearing housing according to the invention.

FIG. 2 is a perspective view from another angle of the bearing housing according to the invention, shown in partial section.

FIG. 3 is a sectional view of a bearing housing according to the invention, and

FIG. 4 is a partial sectional view taken along line IV-IV of the bearing housing shown in FIG. 3.

BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT

In FIG. 1 shows a perspective view of a bearing housing 1 for a rolling bearing, which is preferably molded preferably from nodular cast iron / ductile iron, which is a fairly inexpensive material, while the rolling bearing housing includes a thrust bearing portion 2 made integrally with a substantially cylindrical the main part 3, forming a cylindrical socket 4 for placement in it of an unshown rolling bearing.

There is an integral rolling bearing housing made with an internal passage for a cooling medium, preferably coolant, while the passage is not visible from the outside of the bearing housing, but is located inside openings 5 sealed by fluid-tight closures 6.

In FIG. 2 shows the bearing housing 1 of FIG. 1 in a slightly different view in perspective, while a portion of the bearing housing is shown in section. This view illustrates the lower part of the thrust bearing portion 2 and how the bearing housing 1 product is made with an inner passage 7 arched from the inlet 8 at the thrust bearing portion 2 near the cylindrical socket 4, but spaced from it by a continuous layer of material 8, while the passage 7 (although not shown in this view) communicates with an outlet 10 at a thrust portion 2.

Since it is preferable that the rolling bearing housing accommodate as large rolling bearings as possible, it has a rather thin wall outside the passage 7, while it is preferable that this wall portion is less than 15% of the diameter of the bearing seat 4. A larger bearing will be able to absorb large loads. In an embodiment of continuous casting lines, it is important to have as large rolling bearings as possible, as well as have a cooling passage 7 surrounding a portion of the bearing housing. Such relatively thin-walled sections can be obtained through the use of high precision castings.

Section 2 of the thrust bearing housing 1 has additional blind holes 11 extending from the outer side of the thrust bearing portion 2 for a short distance in the material of the bearing housing 1, but separated from the passage 7 for the cooling medium. These blind holes 11 serve to attach the bearing housing 1 to the support structure using screws not shown or the like.

Holes 5, which at this stage are not closed by closures, are arranged so as to communicate with the passage 7 so that the inner part of the passage 7 can be in contact with the outer part of the bearing housing 1 when the closures are removed.

In FIG. 3 is a sectional side view of a bearing housing 1 according to the invention.

It is shown here that the passage 7 extends between the inlet 8 and the outlet 10 for the cooling medium, and that the passage 7 surrounds a part of the cylindrical bearing housing 4 inside the cylindrical main part 3 of the bearing housing 1. In this view, it can also be seen that in the illustrated embodiment, there are four closed openings 5 evenly spaced along the passage 7. As in the case of FIG. 1, the openings 5 are closed by closures 6 in a fluid tight manner.

According to an embodiment, the passage 7 extends around the upper part of the rolling bearing housing near the cylindrical seat 4, but is spaced from it by a continuous layer of material 9, while the inner passage 7 extends at least more than half the circumference around the upper part of the cylindrical bearing housing 4 . The advantage of the one-piece bearing housing with an internal passage 7 for the cooling fluid is that the risk of leakage from the passage 7 is reduced. In earlier embodiments, including welded caps to the bearing housing and split bearing housings, the risk of leakage of the cooling fluid was high . Thus, the integral bearing housing according to the invention allows the passage 7 to extend more than half the circumference of the cylindrical bearing housing 4 without passing through the plane of the separable bearing housing and / or without being connected to the cover, as can be seen in FIG. 3.

Since it is preferable, as already noted above, to have such a thin wall between the passage 7 and the upper part of the rolling bearing housing, which is affected by heavy slabs or other loads, it is possible to make the passage 7 with one or more internal ribs 13 serving as a reinforcement supporting outer wall.

In FIG. 4 shows a section along the line IV-IV shown in FIG. 3, and from this view it can be seen that there can be more than one rib 13, and in addition, these ribs can be placed in different parts of the passage 7, where they can also serve to create a turbulent flow of a cooling medium, in order to increase the ability to remove as much excess heat as possible. The shape of the ribs can be made in many different ways. By developing an appropriate rib design, a different flow of cooling medium can be obtained, and it is also possible to improve the strength of the rib. For example, in an embodiment not shown in the drawings, the ribs have a substantially circular cross section.

As already mentioned, the bearing housing 1 according to the invention is preferably molded preferably from nodular cast iron / ductile iron, which is a relatively inexpensive material, while the holes 5 in communication with the passage 7 forming the jacket for the cooling medium are designed to facilitate the production of castings with integrated passage 7. With the newly proposed bearing housing, there is no need to select a material suitable for welding.

For casting a rolling bearing housing with at least one internal cooling passage 7, it is advisable to use high precision casting, for example, casting in shell molds, casting according to wax models or casting on raw. Using such casting methods, it is possible to obtain a rolling bearing housing that meets the accuracy class CT8, compared to CT10 or CT12 using conventional casting methods, and with such high accuracy classes it is not necessary to machine the rolling bearing housing because it already has cast surface treatment of a sufficiently high class.

As can be seen in FIG. 2, the passage 7 is filled with a core-forming material 12, for example sand, which is stabilized in a known manner using a material that will be degassed by the elevated temperature of the casting, and thus lose its stabilizing effect after casting.

After casting, the core material can be removed through openings 5, which are subsequently closed in a fluid-tight manner by means of closures 6. According to an embodiment, closures 6 can be attached to the bearing housing 1 by a threaded connection (not shown in the drawings ) It should be noted that none of the holes 5 is located in the upper part of the bearing housing, since this part of the rolling bearing housing will be subjected to stress and adverse environmental conditions, in particular when using the rolling bearing housing in a rolling line for a continuous casting machine, where the upper part of the rolling bearing housing will absorb the load of slabs of material fed to the rolling line, and where the rolling bearing housing is exposed to heat from the slabs, ystviyu moisture and dirt.

The fact that the bearing housing is a one-piece element made of nodular cast iron with a built-in water jacket formed by the passage 7, and the fact that there will be no welding of covers over the passage, means that the bearing housing can be produced at a significantly lower cost than earlier embodiments with soldered bearing caps and / or sealed bearing housings, while also there are no possible product quality problems, mainly cracks and corrosion problems, caused by e welds. Thus, the service life of the bearing housing also increases. Nodular cast iron also creates a passive surface layer, preventing corrosion of the casing. The inventors found that even in difficult environmental conditions, for example, during continuous casting, nodular cast iron will create a passive surface layer.

Since molded articles can have a certain porosity, at least the outer surface of the rolling bearing housing 1 is preferably treated with an impregnation to clog any pores that appear after the casting process. Preferably, the impregnation was made of polymer and resin.

Nodular cast iron / ductile iron can be replaced, for example, with martensitic steel, which, however, is more expensive than spheroidal cast iron / ductile iron. An advantage of the present invention is that it enhances freedom in the selection of appropriate housing materials, due to the fact that the selected material does not need to be suitable for welding.

As mentioned in the introductory part of the description, the rolling bearing housing is of the type described and defined in the accompanying claims, although it is useful in many applications, in particular, it is particularly well suited for use in all types of rolling lines of a continuous casting machine, and therefore the application also includes a claim relating to a rolling line for a continuous casting machine provided with bearing housings according to the preceding claims. The proposed bearing housing has a combination of features, making the bearing housing well suited for working in the environment created by a continuous casting machine, characterized by a lack of free space, high loads and harsh environmental conditions, including very high temperatures and the use of various chemicals.

The invention is not limited to the embodiment shown in the accompanying drawings and described with reference to them, however, variations and modifications are possible within the scope of the attached claims.

Claims (14)

1. The bearing housing (1) for a rolling bearing, made with at least one inner passage (7) with an inlet (8) and an outlet (10) for a cooling medium, characterized in that the rolling bearing housing (1) It is a solid element with a passage (7) for the cooling medium, which is fully integrated into the bearing housing product. 2. The housing (1) of the rolling bearing according to claim 1, in which the housing (1) of the bearing is integrally cast from nodular cast iron / ductile iron. 3. The housing (1) of the rolling bearing according to claim 1, in which the housing (1) of the bearing is integrally cast from martensitic steel. 4. The housing (1) of the rolling bearing according to any one of claims 1 to 3, in which at least the outer surface of the bearing housing (1) is treated with impregnation to clog any pores that appear after the casting process. 5. The housing (1) of the rolling bearing according to claim 4, in which the impregnation is made of polymer and resin. 6. The housing (1) of the rolling bearing according to claim 1, in which at least one inner passage (7) has a plurality of additional holes (5) used to extract the core material (12) after the casting process and closed by a fluid-tight media with closures (6). 7. The housing (1) of the rolling bearing according to claim 6, in which additional holes (5) are located in other parts of the bearing housing other than its upper part. 8. The housing (1) of the rolling bearing according to claim 1, in which at least one stabilizing rib (13) is provided in the passage (7) for the cooling medium 9. The housing (1) of the rolling bearing according to claim 8, in which the stabilizing rib (13) creates a turbulent flow of cooling medium in the passage (7). 10. The rolling bearing housing (1) according to claim 1, in which the thickness of the material of the wall of the bearing housing outside the passage (7) for the cooling medium in the extreme upper portion of the bearing housing is less than 15% of the diameter of the bearing housing (4) located inside the housing ( 1) a bearing to accommodate a rolling bearing in it. 11. The housing (1) of the rolling bearing according to claim 8, in which at least one stabilizing rib (13) is provided in the upper part of the passage (7) for the cooling medium to strengthen the outer wall of the passage (7) for the cooling medium against deformation caused by loads on the upper part of the rolling bearing housing. 12. The rolling bearing housing (1) according to claim 1, having an inner cylindrical seat (4) for accommodating the bearing therein, while the inner passage (7) continues in the form of an arc around the upper part of the rolling bearing housing and near the cylindrical seat (4) However, it is spaced from it by a continuous layer (9) of material, while the inner passage (7) continues at least more than half the circumference around the upper part of the cylindrical bearing housing (4). 13. The rolling bearing housing (1) according to claim 12, wherein the inner passage (7) continues in an arc around the upper part of the rolling bearing housing from the inlet (8) at the bearing housing portion (2) of the bearing housing to the outlet (10) at section (2) of the bearing housing. 14. A rolling line for a continuous casting machine, characterized in that it comprises at least one bearing housing according to any one of claims 1 to 13.

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